Expression of vascular endothelial growth factor has a regulatory role in gingival venules in experimental diabetes

Milán Gyurkovics, Izabella Nagy, Csaba Bodor, A. Székely, E. Dinya, L. Rosivall, Zs. Lohinai

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Background: In the present study, the possible localization and role of vascular endothelial growth factor receptor type 2 (VEGFR2) in the regulation of gingival venules in a rat model of experimental diabetes are examined. Methods: Six weeks after streptozotocin premedication, Wistar male rats presenting blood sugar levels >20 mmol/L were selected for investigation. The VEGFR2 antagonist ZM323881 [5-((7-benzyloxyquinazolin- 4-yl)amino)-4-fluoro-2-methylphenol-hydrochloride] (20 μg/mL) was dripped onto the gingiva between the mandibular incisors. Changes in diameter of the selected gingival venule were measured by vital microscopy combined with digital photography at specified times. Immunohistochemical staining was used to localize VEGFR2. For controls, the same protocol was used on animals with normal blood sugar levels and healthy gingiva. Results: There was a significant difference between the baseline venule diameter of the diabetic and the control groups (47 ± 1 and 28 ± 2 mm, respectively). After 15, 30, and 60 minutes of local application of ZM323881, significant vasoconstriction was observed in the venules of diabetic rats compared with the baseline (81.4% ± 4.6%, 81.8% ± 4.4%, and 80.6% ± 5.1%, respectively). The control group showed no change in the venule diameter. The immunohistochemical analysis showed significantly increased VEGFR2 expression in the mast cells along the venules in the diabetic group, whereas mast cells were rarely found in the control group. Conclusions: The findings suggest that VEGF expression is increased in gingiva in experimentally induced diabetes. After VEGFR2 activation, the mast cell-derived vasodilatory and inflammatory mediators may contribute markedly to the concomitant changes in the microcirculation.

Original languageEnglish
Pages (from-to)e27-e34
JournalJournal of Periodontology
Volume87
Issue number3
DOIs
Publication statusPublished - Mar 1 2016

Keywords

  • Diabetes mellitus
  • Gingiva
  • Inflammation
  • Mast cells
  • Vascular endothelial growth factor receptor-2 antagonist
  • Vasodilation

ASJC Scopus subject areas

  • Periodontics

Fingerprint Dive into the research topics of 'Expression of vascular endothelial growth factor has a regulatory role in gingival venules in experimental diabetes'. Together they form a unique fingerprint.

  • Cite this